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CVE-2026-12519— Out-of-bounds stack read and write in Zephyr WNC-M14A2A modem socket-notify parsing

Quick assessment

Affected
zephyrproject zephyr
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Zephyr是Zephyr组织开源的一款面向物联网的实时操作系统。 Zephyr 1.13.0版本至4.4.2之前版本存在缓冲区错误漏洞，该漏洞源于WNC-M14A2A LTE-M modem driver在on_cmd_socknotifyev()函数中未正确处理未请求的%NOTIFYEV事件，边界检查不严导致越界读取和写入，可能造成栈信息泄露及调制解调器RX线程崩溃（拒绝服务）。

CVSS 5.0 · Medium EPSS 0.16% · P6

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 1

VendorProduct Version RangeStatus
zephyrproject zephyr 1.13.0< 4.4.2 affected
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I. Basic Information for CVE-2026-12519

Vulnerability Information
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Vulnerability Title
Out-of-bounds stack read and write in Zephyr WNC-M14A2A modem socket-notify parsing
Source: CVE Program / CVE List V5
Vulnerability Description
The WNC-M14A2A LTE-M modem driver mishandles unsolicited %NOTIFYEV: events in on_cmd_socknotifyev() (drivers/modem/vendor_standalone/wncm14a2a.c). The response line is linearized into a fixed 40-byte stack buffer via net_buf_linearize(), which caps the copy at 39 bytes and returns out_len <= 39. The two quote-delimiter scanning loops, however, were bounded by len — the full CR/LF-delimited frame length returned by net_buf_findcrlf() — rather than by out_len. When a %NOTIFYEV: line longer than 39 bytes contains no " within the linearized region, the loop indices p1/p2 walk past value[39] and read adjacent stack memory until a stray quote byte is found or the index reaches len. The over-read string is then passed to strncmp()/atoi()/LOG_*, and if a quote byte is found out of bounds the subsequent value[p2] = '\0' performs a single-NUL out-of-bounds stack write at an attacker-influenced offset. The %NOTIFYEV: payload carries network-derived content (LTIME network time, SIB1 base-station system information, CSPS/RRCSTATE), so a rogue cellular base station, a malicious or compromised modem module, or RF manipulation that induces an over-long notify line reaches the defect without any application interaction; the handler runs automatically on the unsolicited event in the modem RX thread. The impact is out-of-bounds stack disclosure (into logs and parsing) and stack corruption that can crash the modem RX thread (denial of service). The write offset is only weakly controlled, so memory-safe code execution is not demonstrated. The fix bounds both scanning loops by out_len, keeping all accesses within the linearized buffer.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
Source: CVE Program / CVE List V5
Vulnerability Title
Zephyr 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Zephyr是Zephyr组织开源的一款面向物联网的实时操作系统。 Zephyr 1.13.0版本至4.4.2之前版本存在缓冲区错误漏洞，该漏洞源于WNC-M14A2A LTE-M modem driver在on_cmd_socknotifyev()函数中未正确处理未请求的%NOTIFYEV事件，边界检查不严导致越界读取和写入，可能造成栈信息泄露及调制解调器RX线程崩溃（拒绝服务）。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
zephyrproject zephyr 1.13.0 ~ 4.4.2 -

II. Public POCs for CVE-2026-12519

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III. Intelligence Information for CVE-2026-12519

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Patches & Fixes for CVE-2026-12519 (1)

Vendor Advisories for CVE-2026-12519 (1)

Same Patch Batch · zephyrproject · 2026-08-17 · 4 CVEs total

CVE-2026-9771 8.8 HIGH Missing device-pointer validation in flash_copy() syscall allows userspace privilege escal
CVE-2026-12629 4.6 MEDIUM PL011 UART error interrupts never cleared, enabling an external-peer interrupt-storm denia
CVE-2026-12630 4.3 MEDIUM 6LoWPAN IPHC uncompression out-of-bounds read on reserved destination addressing mode

IV. Related Vulnerabilities

Same product: zephyr
Same vendor: zephyrproject
Same weakness: CWE-787

V. Comments for CVE-2026-12519

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